> it was normal for Studio headphones to have high impedance

it was because the output imp of source devices. it wasn't "normal", it was a must.

The treble on the 900 Pro X is actually within tolerances, it's not the same treble excesses as present in the older DT models so if you're still experiencing sibilance then yes, you're treble averse...

I can send an EQ preset to test if you're keen on experimenting with that.

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Either 64 audio as other said, or fir audio m5. Since it has circle logo like thing.
image : https://www.headfonia.com/wp-content/uploads/2020/09/Fir-Audio-M5-23.jpg

Also you can't put headphone inside your ears.

Looks like a Custom 64 Audio IEM... It has the Alex modules preset in the image so I'd hazard that guess

due to very poor quality of the picture it is pretty hard what headphone is this. but after hours of processing and comparison, I think this is in ear monitor

Looks like Audio 64 A18 custom

IEM

In ear headphones

Speaker measurement is a lot more complicated than headphone measurement. A headphone measurement rig can accommodate basically all headphone types and or can be tested in many locations. Changing location does not impact the headphone's sound, it's going to be the same everywhere. But for speakers, sound bounces off of surroundings and the shadow of the room will impact the sound of speakers (less relevant for laptop speakers, but same points). That's why it's easy to have a database of all headphone measurements. In order to measure speakers you will need to do it yourself in your normal environment, take measurements from different points in your room, and use a specialized microphone for precise readings. You can't simply have a database of all speakers, and using those measurements for an EQ will not work.

I depends on the device, I have a K5 Pro as well (AKM version) and it doesn't get remotely hot at all but also have a Topping A90 that does get quite hot. And a xDuoo TA-26 (tube amp) that gets even hotter. Even for that matter a Moondrop MoonRiver 2 dongle gets quite hot.

I've heard mixed things about the 660s2, a lot of people seem to prefer the 600's or 650's. Haven't heard any of them myself though.

Be careful with them though. While they truly offer great products, they also have some cash grabs that underperform or straight up lie in the specs.

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I have built one (actually two) Ching-feng E100, the top left and the middle right ones in aluminum. It's nice but really hot.

No way. There's a continuous hole from the ear tip to the back, if it gets too deep in there how could water get out? Blessing2s are fragile.

qigom k100? (32/60/300/500/700/900 ohm?) in these offers buy the 500, I hope you surprise me

i've been testing some less expensive qigom models and the n90q is fabulous and the others have their own charm as well (hd800, hd650, 777)

To be honest this point is always neglected. Iems are prone to be exposed to moisture, a rating will be useful to understand the limitations.

Mainstream products adress this much better, say Samsungs buds.

I think I’d go for the OpenAlpha first. It’s a known design that is known to sound pretty good, and it’s easy to modify it a bit and experiment around. If you start with something custom, it may take a long time to see something that actually works well, so that may be worthwhile as a longer-term project.

AliExpress. Just Look up Headphone Tube Amp. I think I'm going to bite the bullet on this one specifically

Where did you find these? What are they called?

Yeah, sure for 8. Do you think somebody believe you? I suspect that many people here dont even know what realy is on the picture.

Well, in Japanese the car model written as アリア, so "Aria" would be correct.

I guess Nissan having issues with converting Katagana to Romaji or vise versa. Explains the quality of their cars